1899509980 has 24 divisors (see below), whose sum is σ = 3990153888. Its totient is φ = 759578688.

The previous prime is 1899509957. The next prime is 1899509981. The reversal of 1899509980 is 899059981.

It is a happy number.

1899509980 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899509981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66217 + ... + 90463.

It is an arithmetic number, because the mean of its divisors is an integer number (166256412).

Almost surely, 2^1899509980 is an apocalyptic number.

1899509980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1899509980 is an abundant number, since it is smaller than the sum of its proper divisors (2090643908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1899509980 is a wasteful number, since it uses less digits than its factorization.

1899509980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28173 (or 28171 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 58.

The square root of 1899509980 is about 43583.3681580485. The cubic root of 1899509980 is about 1238.4558432273.

The spelling of 1899509980 in words is "one billion, eight hundred ninety-nine million, five hundred nine thousand, nine hundred eighty".